Window bird feeder



FIG. 1 is a front elevational view of a window bird feeder showing mynew design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a bottom plan view thereof.

The ornamental design for a window bird feeder, substantially as shown.